Causes of wood blue change and prevention methods
What does blue wood mean
Usually referred to as "blue change" is the most common wood discoloration, it is due to color-changing bacteria into the surface of the wood into grayish blue. Cyanobacteria are sensitive to temperature and humidity, and are very active in a high humidity environment of 23-35 degrees, and can turn the entire board blue in 2 to 3 days. That is to say, in the humid and hot summer, if the log is not cut and dried in time after logging, it is vulnerable to infection by cyanobacteria.
Why does wood turn blue
Blue fungi use wood rays and parenchyma nutrients such as starches, sugars and proteins, which are essential for fungal growth and reproduction. The hyphae of cyanobacteria secrete pigments that spread from one cell to neighboring cells. The heartwood has fewer nutrients, so it is not easy to change color. Moreover, the reaction between the enzymes secreted by the blue fungus and the phenolic substances in the wood will also cause the blue change of the wood, such as the blue change of paulownia is because the wood contains catalpol.
Wood blue turn harm
Blue wood will decay more easily, and reduce its toughness, bending strength, and compressive strength. If you do not use effective control measures for sapwood blue wood, it may cause mycelium to continue to multiply inside the wood, so that the heartwood blue, reduce the use value of wood.
